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How to create AJAX Notifications with jQuery It'll be very easy to view the type of this notification if you're using GMail one the web based environment. Today, the author of this post guides you to build a simple application for displaying the notifications, using jQuery.


If you're using Ajax, you should give hints to the user when a request to the server is being made, and you should tell him if something goes wrong. Gmail does this really well. Here's how I coded it:

First, add this to your layout:

<div id="ajaxNotifications"></div>
Add some CSS to make it purty:
#ajaxNotifications {
position: fixed;
top: 0px;
right: 0px;
background: yellow;
text-color: black;
padding: 5px;
display: none;
}
Setup jQuery, jQuery UI, and your own application.js file. This syntax is for Rails, but it's similar in Python:
<script src="http://www.google.com/jsapi" type="text/javascript"></script>
<script type="text/javascript">
<% extras = RAILS_ENV == "development" ? "{ uncompressed: true }" : "{}" %>
google.load("jquery", "1.3.2", <%= extras %>);
google.load("jqueryui", "1.7.2", <%= extras %>);
</script>
<%= javascript_include_tag "application" %>
Finally, here's application.js to pull it all together:
// This is the main application object.  It follows the module pattern.
var application = function () {
// Private functions and data go here.

return {
// Public functions and data go here.
HTTP_CONFLICT: 409,

// Show the user a quick little message.
showAjaxNotification: function(text) {
$("#ajaxNotifications").text(text).show();
},

// Hide the message. If possible, use hideAjaxNotificationIfMatches
// instead.
hideAjaxNotification: function() {
$("#ajaxNotifications").hide().text("");
},

// Hide the message, but only if it matches the given text.
hideAjaxNotificationIfMatches: function(text) {
if ($("#ajaxNotifications").text() == text) {
application.hideAjaxNotification();
}
}
};
}();

$(document).ready(function() {
var loadingMessage = "Loading...";

// When an Ajax request is being made, tell the user "Loading...".
$(this).ajaxStart(function() {
application.showAjaxNotification(loadingMessage);
});

// Only if it completes normally do we hide the message.
$(this).ajaxSuccess(function() {
application.hideAjaxNotificationIfMatches(loadingMessage);
});

// Otherwise, we give the user an error message.
$(this).ajaxError(function(event, xhr, ajaxOptions, thrownError) {

// If we get an HTTP_CONFLICT, it means our data is stale. Reload the
// page. To test this functionality, use two tabs in your browser.
if (xhr.status == application.HTTP_CONFLICT) {
location.reload();
}

// Otherwise, just tell the user something went wrong.
else {
application.showAjaxNotification("Request failed: could not contact server");
}
});
});

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